polindrome fundamentals

function polindrome(arr) {
    let result = "";
    for (let num of arr) {
        let isPolindrome = `true`;
        num = String(num);
        let mid = parseInt(num.length / 2);
        for (let i = 0; i <= mid; i++) {
            let lastIndex = num.length - 1;
            if (num[i] !== num[lastIndex - i]) {
                isPolindrome = `false`;
                break;
            }
        }
        result += isPolindrome + `\n`;
        }
        return result;
}